Scandium and phosphorus co-doped perovskite oxides as high-performance electrocatalysts for the oxygen reduction reaction in an alkaline solution

Xu, M.; Sun, Hainan; Wang, Wei; Shen, Yujuan; Zhou, Wei; Wang, Jun; Chen, Huajun; Shao, Zongping

doi:10.1016/j.jmst.2019.09.007

Cited by 27 publications

(4 citation statements)

References 39 publications

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“…The XPS spectra of Fe 2p 3/2 were divided into two parts at approximately 708.9 eV (Fe 3+ ) and 710.3 eV (Fe 4+ ), with weak satellite shake-up peaks at 717.1–717.9 eV ( Figure 4 a) [ 35 , 36 , 37 ]. The Mn 2p 3/2 spectra exhibited two distinct peaks at approximately 641.3 eV (Mn 3+ ) and 643.3 eV (Mn 4+ ), as shown in Figure 4 b [ 38 , 39 ]. With increasing Mn doping, the Fe 4+ /Fe 3+ and Mn 4+ /Mn 3+ ratios gradually increased.…”

Section: Resultsmentioning

confidence: 99%

Bonding State and Thermal Expansion Coefficient of Mn-Doped Ba0.5Sr0.5FeO3−δ Perovskite Oxides for IT-SOFCs

Lim,

Yun,

et al. 2023

Nanomaterials

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The oxygen vacancy formation behavior and electrochemical and thermal properties of Ba0.5Sr0.5Fe1−xMnxO3−δ (BSFMnx, x = 0–0.15) cathode materials were investigated. For thermogravimetric analysis, the weight decreased from 1.98% (x = 0) to 1.81% (x = 0.15) in the 400–950 °C range, which was due to oxygen loss from the lattice. The average oxidation state of the B-site increased, the Oads/Olat ratio decreased, and the binding energy of the Olat peak increased with Mn doping. These results indicate that Mn doping increases the strength of the metal–oxygen bond and decreases the amount of oxygen vacancies in the lattice. The electrical conductivity of BSFMnx increased with the temperature due to the thermally activated small-polaron hopping mechanism showing a maximum value of 10.4 S cm−1 (x = 0.15) at 450 °C. The area-specific resistance of BSFMn0.15 was 0.14 Ω cm2 at 700 °C and the thermal expansion coefficient (TEC) gradually decreased to 12.7 × 10−6 K−1, which is similar to that of Ce0.8Sm0.2O2 (SDC) (12.2 × 10−6 K−1). Mn doping increased the metal–oxygen bonding energy, which reduced the oxygen reduction reaction activity but improved the electrical conductivity and thermal stability with SDC.

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Section: Resultsmentioning

confidence: 99%

Bonding State and Thermal Expansion Coefficient of Mn-Doped Ba0.5Sr0.5FeO3−δ Perovskite Oxides for IT-SOFCs

Lim,

Yun,

et al. 2023

Nanomaterials

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“…It is well known that introducing heteroatoms is a simple and efficient way to accelerate sluggish reaction kinetics [ 117 , 118 ]. Table 1 summarizes the substitution of foreign elements for the oxygen electrocatalysis.…”

Section: Overview Of Oxide Catalyst For Oxygen Electrocatalysismentioning

confidence: 99%

Designing Oxide Catalysts for Oxygen Electrocatalysis: Insights from Mechanism to Application

et al. 2023

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The electrochemical oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are fundamental processes in a range of energy conversion devices such as fuel cells and metal–air batteries. ORR and OER both have significant activation barriers, which severely limit the overall performance of energy conversion devices that utilize ORR/OER. Meanwhile, ORR is another very important electrochemical reaction involving oxygen that has been widely investigated. ORR occurs in aqueous solutions via two pathways: the direct 4-electron reduction or 2-electron reduction pathways from O2 to water (H2O) or from O2 to hydrogen peroxide (H2O2). Noble metal electrocatalysts are often used to catalyze OER and ORR, despite the fact that noble metal electrocatalysts have certain intrinsic limitations, such as low storage. Thus, it is urgent to develop more active and stable low-cost electrocatalysts, especially for severe environments (e.g., acidic media). Theoretically, an ideal oxygen electrocatalyst should provide adequate binding to oxygen species. Transition metals not belonging to the platinum group metal-based oxides are a low-cost substance that could give a d orbital for oxygen species binding. As a result, transition metal oxides are regarded as a substitute for typical precious metal oxygen electrocatalysts. However, the development of oxide catalysts for oxygen reduction and oxygen evolution reactions still faces significant challenges, e.g., catalytic activity, stability, cost, and reaction mechanism. We discuss the fundamental principles underlying the design of oxide catalysts, including the influence of crystal structure, and electronic structure on their performance. We also discuss the challenges associated with developing oxide catalysts and the potential strategies to overcome these challenges.

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“…Wellknown ORR and OER bifunctional electrocatalytic materials are mainly composed of carbon-based materials and transitionmetal-based materials [17][18][19][20][21][22][23]. Perovskite oxides have considerable potential as excellent catalytic materials because of their high compositional versatility and electronic environments [24][25][26][27][28]. A-site doping influences the amount of oxygen species formed, while B-site doping changes the type of oxygen species and B-O bonds.…”

Section: Introductionmentioning

confidence: 99%

La0.75Sr0.25MnO3-based perovskite oxides as efficient and durable bifunctional oxygen electrocatalysts in rechargeable Zn-air batteries

Shui

Tian

et al. 2022

Sci. China Mater.

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Efficient and durable bifunctional oxygen electrocatalysts are critical for advanced rechargeable zinc-air (Zn-air) batteries. However, the obstacle to the development of bifunctional electrocatalysts for the oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) lies in the different requirements of the ORR and OER for catalytic materials. Herein, La 0.75 Sr 0.25 Mn 0.5 X 0.5 O 3 (X = Co, Ni, and Fe) perovskite nanoparticles were created by rationally screening targeted ORR/OER components and precisely controlling their electronic structures to achieve bifunctional oxygen electrocatalysis, in which La 0.75 Sr 0.25 Mn 0.5 Fe 0.5 O 3 (LSFMO) displayed superior ORR performance (E onset of 0.932 V and n of 3.59) and significantly enhanced electrocatalytic activity in the OER process (an E j=10 of 1.658 V and overpotential of 428 mV), corresponding to excellent bifunctional properties (ΔE = 0.94 V). Furthermore, density functional theory (DFT) calculations demonstrated that Mn and Fe dual sites generated by partial substitution had a significant synergistic effect on the electrocatalytic process. The rechargeable Zn-air batteries delivered an unprecedented small charge-discharge voltage polarization (0.76 V), high reversibility and stability over many charge-discharge cycles (60 h). These excellent results demonstrate that Mn-based perovskites with Fe doping are undoubtedly promising bifunctional electrocatalysts for rechargeable Zn-air batteries.

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Scandium and phosphorus co-doped perovskite oxides as high-performance electrocatalysts for the oxygen reduction reaction in an alkaline solution

Cited by 27 publications

References 39 publications

Bonding State and Thermal Expansion Coefficient of Mn-Doped Ba0.5Sr0.5FeO3−δ Perovskite Oxides for IT-SOFCs

Bonding State and Thermal Expansion Coefficient of Mn-Doped Ba0.5Sr0.5FeO3−δ Perovskite Oxides for IT-SOFCs

Designing Oxide Catalysts for Oxygen Electrocatalysis: Insights from Mechanism to Application

La0.75Sr0.25MnO3-based perovskite oxides as efficient and durable bifunctional oxygen electrocatalysts in rechargeable Zn-air batteries

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